Buildings.Electrical.Utilities.Controllers
Package that contains state machines and control models used by the utilities
Information
This package contains state machines and controller models used by the utilities.
Extends from Modelica.Icons.BasesPackage (Icon for packages containing base classes).
Package Content
| Name | Description |
|---|---|
 StateMachineVoltCtrl
|
This model represents a simple voltage controller that unplug a load when there is a voltage fluctuation higher that a given threshold. |
Buildings.Electrical.Utilities.Controllers.StateMachineVoltCtrl
This model represents a simple voltage controller that unplug a load when there is a voltage fluctuation higher that a given threshold.
Information
Function that implements a state machine that detects voltage
deviations. If the voltage input V exceeds the
nominal value V_nominal by more than 1+Vtr
then the control signal y becones zero for
a period equal to tDelay.
A signal y = 0 can be used to turn off a load.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Voltage | V_nominal | Nominal voltage of the node to be controlled [V] | |
| Real | vThresh | 0.1 | Threshold that activates voltage ctrl (ratio of nominal voltage) |
| Time | tDelay | 300 | Time to wait before plugging the load back [s] |
Connectors
| Type | Name | Description |
|---|---|---|
| input RealInput | V | Voltage of the node to be controlled |
Modelica definition
model StateMachineVoltCtrl "This model represents a simple voltage controller that unplug a load when
there is a voltage fluctuation higher that a given threshold."
Modelica.Blocks.Interfaces.RealInput V "Voltage of the node to be controlled";
parameter Modelica.Units.SI.Voltage V_nominal
"Nominal voltage of the node to be controlled";
parameter Real vThresh(min=0.0, max=1.0) = 0.1
"Threshold that activates voltage ctrl (ratio of nominal voltage)";
parameter Modelica.Units.SI.Time tDelay=300
"Time to wait before plugging the load back";
output Real y
"Output signal that represents whether the load should be connected to the grid or not";
protected
discrete Boolean connected
"Boolean variable that indicates when the load is connected";
discrete Real tSwitch "Time instant when the last event occurred";
initial algorithm
// Initialize with load connected and last event at t = 0
connected := true;
tSwitch := 0;
equation
// Output for every state, connected or not
if connected then
y = 1.0;
else
y = 0.0;
end if;
algorithm
// Detect an overshoot in the voltage
when(connected and (V > V_nominal*(1+vThresh))) then
tSwitch := time;
connected := false;
end when;
// Transition between not connected and connected again after the delay time has been elapsed
when(not connected and time >= tSwitch + tDelay) then
connected := true;
end when;
end StateMachineVoltCtrl;